hm, mtu is implemented in the device driver - you might be out of luck.
Begin forwarded message:
Date: Fri, 1 Apr 2005 02:01:19 -0800
Subject: [Bugme-new] [Bug 4430] New: Virtual interfaces cannot have their own
Summary: Virtual interfaces cannot have their own mtu
Kernel Version: kernel-2.6.9-1.6_FC2
Distribution: Fedora Core 2,3
Hardware Environment: Broadcom gigabit card using tg3 (Tyan s2885 onboard)
eth0 and eth0:1 cannot have different mtus. I have a jumbo-frame capable switch
with three devices plugged in. Two are PCs with jumbo-capable cards, the other
is a wireless router which isn't, and hangs if either PC attempts to discover
whether it can support jumbo frames.
To get the benefit of jumbo frames between the two PCs, I tried to set up eth0:1
- on a different subnet to the wireless router - on both PCs, and set the mtu of
the eth0:1 to 9000. However it is not possible to set the mtu for eth0:1 to 9000
without setting the mtu of eth0 to 9000 as well.
Also noted in http://xcat.org/pipermail/xcat-user/2003-April/002358.html
------- You are receiving this mail because: -------
You are on the CC list for the bug, or are watching someone who is.